全文获取类型
收费全文 | 49篇 |
免费 | 1篇 |
国内免费 | 2篇 |
专业分类
化学 | 25篇 |
数学 | 21篇 |
物理学 | 6篇 |
出版年
2021年 | 1篇 |
2017年 | 1篇 |
2014年 | 3篇 |
2012年 | 2篇 |
2011年 | 5篇 |
2008年 | 1篇 |
2007年 | 1篇 |
2005年 | 4篇 |
2004年 | 1篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2001年 | 1篇 |
2000年 | 3篇 |
1994年 | 2篇 |
1992年 | 1篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有52条查询结果,搜索用时 15 毫秒
11.
Joanna Aizenberg Gretchen Lambert Steve Weiner Lia Addadi 《Journal of the American Chemical Society》2002,124(1):32-39
The majority of invertebrate skeletal tissues are composed of the most stable crystalline polymorphs of CaCO(3), calcite, and/or aragonite. Here we describe a composite skeletal tissue from an ascidian in which amorphous and crystalline calcium carbonate coexist in well-defined domains separated by an organic sheath. Each biogenic mineral phase has a characteristic Mg content (5.9 and 1.7 mol %, respectively) and concentration of intramineral proteins (0.05 and 0.01 wt %, respectively). Macromolecular extracts from various biogenic amorphous calcium carbonate (ACC) skeletons are typically glycoproteins, rich in glutamic acid and hydroxyamino acids. The proteins from the crystalline calcitic phases are aspartate-rich. Macromolecules extracted from biogenic ACC induced the formation of stabilized ACC and/or inhibited crystallization of calcite in vitro. The yield of the synthetic ACC was 15-20%. The presence of Mg facilitated the stabilization of ACC: the protein content in synthetic ACC was 0.12 wt % in the absence of Mg and 0.07 wt % in the presence of Mg (the Mg content in the precipitate was 8.5 mol %). In contrast, the macromolecules extracted from the calcitic layer induced the formation of calcite crystals with modified morphology similar to that expressed by the original biogenic calcite. We suggest that specialized macromolecules and magnesium ions may cooperate in the stabilization of intrinsically unstable amorphous calcium carbonate and in the formation of complex ACC/calcite tissues in vivo. 相似文献
12.
We present a colourimetric litmus test for simple differentiation of organic liquids based on wetting, which achieves chemical specificity without a significant sacrifice in portability or ease-of-use. Chemical specificity is derived from the combination of colourimetric wetting patterns produced by liquids in an array of inverse opal films, each having a graded wettability, but using different surface groups to define that gradient. 相似文献
13.
Victor V. Volkov Jonathan McMaster Joanna Aizenberg Carole C. Perry 《Chemical science》2021,13(1):133
We report how Raman difference imaging provides insight on cellular biochemistry in vivo as a function of sub-cellular dimensions and the cellular environment. We show that this approach offers a sensitive diagnostic to address blood biochemistry at the cellular level. We examine Raman microscopic images of the distribution of the different hemoglobins in both healthy (discocyte) and unhealthy (echinocyte) blood cells and interpret these images using pre-calculated, accurate pre-resonant Raman tensors for scattering intensities specific to hemoglobins. These tensors are developed from theoretical calculations of models of the oxy, deoxy and met forms of heme benchmarked against the experimental visible spectra of the corresponding hemoglobins. The calculations also enable assignments of the electronic transitions responsible for the colour of blood: these are mainly ligand to metal charge transfer transitions.We assign the electronic transitions responsible for the colour of blood and present a Raman imaging diagnostic approach for individual blood cells. 相似文献
14.
15.
I. B. Aizenberg 《Journal of Mathematical Sciences》1990,50(5):1831-1833
Translated from Issledovaniya po Prikladnoi Matematike, Kazan', No. 14, pp. 62–66, 1987. 相似文献
16.
A complete diagram of the Stark sublevels of Pr3+ for the P0,1;1D2;3F2,3 terms has been constructed on the basis of a study of the absorption and luminescence spectra of CaWO4 crystals containing Pr3+. Strong splitting of the Pr3+ terms in the environment examined has been established.The authors would like to thank Assistant Professor L. Ya. Shekun for suggesting the subject of this work and for his constant interest. 相似文献
17.
Fluorogel Elastomers with Tunable Transparency,Elasticity, Shape‐Memory,and Antifouling Properties 下载免费PDF全文
Dr. Xi Yao Dr. Stuart S. Dunn Dr. Philseok Kim Meredith Duffy Jack Alvarenga Prof. Joanna Aizenberg 《Angewandte Chemie (International ed. in English)》2014,53(17):4418-4422
Omniphobic fluorogel elastomers were prepared by photocuring perfluorinated acrylates and a perfluoropolyether crosslinker. By tuning either the chemical composition or the temperature that control the crystallinity of the resulting polymer chains, a broad range of optical and mechanical properties of the fluorogel can be achieved. After infusing with fluorinated lubricants, the fluorogels showed excellent resistance to wetting by various liquids and anti‐biofouling behavior, while maintaining cytocompatiblity. 相似文献
18.
19.
20.